Effect of very small additions on the coercivity of Dy-free Nd-Fe-(Co)-B-sintered magnets

被引：29

作者：

Gabay, AM ^{[1
]}

Zhang, Y ^{[1
]}

Hadjipanayis, GC ^{[1
]}

机构：

[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 238卷 / 2-3期

关键词：

permanent magnets; Nd-Fe-B; powder blending technique; sintering; Nd-rich phase; coercivity;

D O I：

10.1016/S0304-8853(01)00917-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of small substitutions on the coercivity of Nd-Fe-B and Nd-Fe-Co-B-sintered magnets has been investigated. Addition of 0.18 at% Ga was found to be the most effective for improving the coercivity in both Nd-Fe-B and Nd-Fe-Co-B without decreasing much the remanent magnetization, Scanning electron microscopy on Ga-free and Ga-added magnets did not reveal a noticeable difference in phase morphology. However, Fe and especially Co concentrations in the intergranular Nd-rich phase were found to be markedly increased after the small Ga addition. Combined addition of Co with a small amount of Cu did not increase the coercivity of the Dy-free magnets, However, none of the examined very small additives can yet be considered as an alternative to Dy for extending operating temperature range of the high-energy Nd-Fe-B magnets. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：226 / 232

页数：7

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